JavaScript Number toLocaleString() Method

The toLocaleString() method converts a number into a string, using a local language format. The language depends on the locale setup on your computer.

Syntax:

number.toLocaleString(locales, options)

Parameters: This method accepts two parameters locales and options.

• locales: This is an optional parameter. It specifies the language format to be used.
• options: This parameter is also an optional one.
  • It includes maximumFractionDigits that represent a number from 0 to 20 (default is 3)
  • It includes maximumSignificantDigits that represent a number from 1 to 21 (default is 21).

Note: There are other options as parameters such as minimumFractionDigits, minimumSignificantDigits, currency, and many more. The developer can use them as per the requirement of the application.

Return value: The return value can be a string that represents a number.

Example: The following code demonstrates all the conversions.

// Declaring an variable a
let n = new Number(705870689);
console.log("ar-SA: " 
            + n.toLocaleString("ar-SA"));
console.log("bn-BD: " 
            + n.toLocaleString("bn-BD"));
console.log("bn-IN: " 
            + n.toLocaleString("bn-IN"));
console.log("cs-CZ: " 
            + n.toLocaleString("cs-CZ"));

Output:

ar-SA: ٧٠٥٬٨٧٠٬٦٨٩
bn-BD: ৭০,৫৮,৭০,৬৮৯
bn-IN: ৭০,৫৮,৭০,৬৮৯
cs-CZ: 705 870 689

Example 2: The following example demonstrates the style and currency attributes.

// Declaring an variable a
let a = new Number(159900);

// Creating an dictionary like object and
// include currency and style
let myObj = {
    style: "currency",
    currency: "EUR"
}

console.log(a.toLocaleString("en-GB", myObj));

Output:

€159,900.00

Supported Browsers:

• Google Chrome 1 and above
• Internet Explorer 3 and above
• Firefox 1 and above
• Apple Safari 1 and above
• Opera 4 and above
• Edge 12 and above

We have a complete list of JavaScript Number constructor, properties, and methods list, to know more about the numbers please go through that article.